The U.S. Navy is working to preserve its use of sonar to protect ships amid concerns the technology harms whales and dolphins, experts say.
The (Norfolk) Virginian-Pilot reported Monday that the Navy has used sonar for more than 70 years, but its continued use is threatened by lawsuits brought by environmentalists.
Jene Nissen, environmental acoustics manager for the Navy's fleet forces command, said it's difficult to assess sonar's effect on mammals because scientists have limited knowledge of dolphin and whale behavior.
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